I think a lot of people will tell you your hair's properties (texture, porosity and elasticity) are more important than your curl pattern. (But I'm new too)
I just wanted to say though, you have BEAUTIFUL hair! I dont think I would ever straighten my hair if it looked likes yours!
That picture looks 2b to me. You have gorgeous hair though. That said I have no doubt that you are a 3a on some days because your hair clearly shows potential to curl more. My own hair has a mind of its own. It can range from straight (though this is very rare) to 2b to 3a. You look like a movie star though. Awesome picture. You have nice healthy hair. Don't worry so much about the actual texture. Your hair's health is most important. Besides all waves, kinks, and curls are accepted at this website. Again, I LOVE your hair!